[英]How to create and use custom control with UpdatePanel added to the page programmatically
I have simple web user control (the code I found somewhere in the web): 我有简单的网络用户控件(我在网络中某处找到的代码):
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs"
Inherits="ARP.DynamicsCRM2011.MagicWebForm.WebUserControl1" %>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox1_CheckedChanged"
Text="Checkbox" />
<asp:Button ID="Button1" runat="server" Text="Button" Visible="False" OnClick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
protected void Page_Load(object sender, EventArgs e)
{
}
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
Button1.Visible = CheckBox1.Checked;
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
}
Now I want to add this control to my page (programmatically in OnLoadComplete event): 现在,我想将此控件添加到我的页面中(以编程方式在OnLoadComplete事件中):
<%@ Reference Control="~/WebUserControl1.ascx" %>
WebUserControl1 myControl = (WebUserControl1)Page.LoadControl("~/WebUserControl1.ascx");
myControl.ID = "myControl_" + some_name;
parentControl.Controls.Add(myControl);
Of course I have SriptManager on the page and my control is added properly. 当然,我的页面上有SriptManager,并且控件已正确添加。 I know that programmatically added controls must be recreated every time the page is loaded.
我知道每次页面加载时都必须重新创建以编程方式添加的控件。 Unfortunately this causes creating new control, so checking checkbox doesn't work - after checking it the OnLoadComplete (of the page) is fired again and new control is created.
不幸的是,这导致创建新控件,因此无法选中复选框-在选中它之后,将再次触发(页面的)OnLoadComplete,并创建新控件。 If I omit that then nothing is displayed.
如果我忽略了,则什么也不显示。 So the question is - how to do this?
所以问题是-如何做到这一点?
Dynamic control should be re-added to the control tree OnPreInit
, see documentation: 动态控件应重新添加到控件树
OnPreInit
,请参阅文档:
PreInit - Create or re-create dynamic controls. PreInit-创建或重新创建动态控件。
You can add that control on button click and save count of added controls in some storage like Session
. 您可以在单击按钮时添加该控件,并将添加的控件的数量保存在某些存储中,例如
Session
。 The in Page_Init
you need to check that count value and recreate each control you have add before. 在
Page_Init
您需要检查该计数值并重新创建之前添加的每个控件。
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